Silencer for racing car
Through the impedance composite structural design, combined with the combination of carbon steel shell, partition, asbestos filling and perforated pipe, the problem that racing mufflers cannot effectively reduce noise is solved, and the noise meets the requirements of the race regulations and does not affect the performance of the engine.
Patent Information
- Application Number
- CN202422391082.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-09-29
- Publication Date
- 2025-07-22
- Estimated Expiration
- 2034-09-29
AI Technical Summary
Existing racing mufflers cannot effectively reduce engine noise to compliance with race regulations and may affect the engine's torque and power.
The impedance composite structural design is adopted, including a carbon steel shell, multiple partitions and through-tube combinations. It uses the asbestos filling and sound-absorbing principle of perforated tubes in different chambers, combined with the arrangement of elbows and through-tubes to form an effective airflow path to eliminate medium and low frequency and high frequency noise.
It realizes that without significantly affecting the engine torque and power, the muffler can effectively reduce noise to meet the requirements of the competition and extend the service life of the muffler.
Smart Images
Figure CN223136242U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of mufflers, in particular to a racing car muffler. Background Art
[0002] For the use of an engine, a muffler is an essential part, which can effectively reduce the noise of the engine. For the cbr600rr four-cylinder engine used in the Formula SAE China, without a muffler, the noise is 115 dB - 150 dB under C-weighting. For some purchased mufflers, first, they cannot meet the requirements of the racing regulations, that is: the noise level of the racing car will be measured using a static method. During the test, the probe of the free-field measurement microphone will be located 0.5 m behind the exhaust gas outlet, horizontal with the exhaust port, and at an angle of 45° with the air flow direction. The transmission is in neutral and the engine is at the specified speed. The upper limit of the noise level at idle speed is 103 dB (fast weighting) under C-weighting. The upper limit of the noise level at other speeds is 110 dB (fast weighting) under C-weighting. The maximum test speed of the engine is calculated by the following method; second, the muffler can provide an appropriate exhaust back pressure so that the torque and power of the engine will not decrease significantly.
[0003] The utility model adopts an impedance compound structure design. Through the simulation of establishing an engine noise module by gt-power, at idle speed, the maximum noise can reach 100 dB(C), and when the speed reaches 11000 rpm, the maximum noise can reach 102 dB(C), meeting the requirements of the racing regulations. In the simulation results, the changes in torque and power are not more than 5% compared with the results without a muffler, which can meet the design requirements. Summary of the Utility Model
[0004] The purpose of the utility model is to solve the defects existing in the prior art, and a racing car muffler is proposed.
[0005] In order to achieve the above purpose, the utility model adopts the following technical scheme:
[0006] A racing car muffler, including a carbon steel shell, a front partition is fixedly installed at the front end of the carbon steel shell, a rear partition is fixedly installed at the rear end of the carbon steel shell, a first partition, a second partition, and a third partition are fixedly installed in the carbon steel shell in sequence from front to back. A first chamber is provided between the front partition and the first partition, a second chamber is provided between the first partition and the second partition, the second chamber is filled with first asbestos, a third chamber is provided between the second partition and the third partition, a fourth chamber is provided between the third partition and the rear partition, and the fourth chamber is filled with second asbestos;
[0007] A straight-through pipe is installed inside the carbon steel shell. The front end of the straight-through pipe is fixed on the front partition board and extends to the front side of the front partition board. The rear end of the straight-through pipe passes through the first chamber and extends into the second chamber, where it is fixedly connected to the front end of a perforated pipe. The rear end of the perforated pipe extends into the third chamber and is fixedly installed on the second partition board. Multiple side holes are provided on the pipe body of the perforated pipe.
[0008] Two straight-through pipes, three straight-through pipes, a 60° elbow, two 60° elbows, four straight-through pipes, three perforated pipes, a 120° elbow, and two perforated pipes are also installed inside the carbon steel shell.
[0009] The front ends of the two straight-through pipes and the three straight-through pipes are fixedly installed on the first partition board and extend into the first chamber. The rear end of the two straight-through pipes is fixed on the second partition board and extends into the third chamber. The rear end of the three straight-through pipes is fixed on the third partition board and extends into the fourth chamber.
[0010] The 60° elbow, the two 60° elbows, the three perforated pipes, the 120° elbow, and the two perforated pipes are all located in the fourth chamber.
[0011] The front end of the 60° elbow is fixed on the rear end of the three straight-through pipes. The rear end of the 60° elbow is fixed on the front end of the two perforated pipes. The rear end of the two perforated pipes is fixed on the front end of the 120° elbow. The rear end of the 120° elbow is fixed on the front end of the three perforated pipes. The rear end of the three perforated pipes is fixed on the front end of the two 60° elbows. The rear end of the two 60° elbows is fixed on the front end of the four straight-through pipes. The four straight-through pipes are fixed on the rear partition board and extend to the rear side of the rear partition board. Side holes are provided on the sides of the two perforated pipes and the three perforated pipes.
[0012] Furthermore, the connections between the front partition board, the first partition board, the second partition board, the third partition board, the rear partition board and the carbon steel shell are all full welds.
[0013] Furthermore, the connections between the straight-through pipe and the front partition board, the first partition board, and the second partition board are all full welds.
[0014] The connections between the two straight-through pipes and the three straight-through pipes and the first partition board and the second partition board are all full welds. The connection between the three straight-through pipes and the third partition board is a full weld.
[0015] The connection between the four straight-through pipes and the rear partition board is a full weld.
[0016] Furthermore, the aperture diameter of the side holes on the perforated pipe is smaller than that of the side holes on the two perforated pipes and the three perforated pipes.
[0017] The perforation rate of the side holes on the perforated pipe is higher than that of the side holes on the two perforated pipes and the three perforated pipes.
[0018] Compared with the prior art, the beneficial effects of the present utility model are as follows:
[0019] Gas enters the muffler from a straight-through pipe 1 and is discharged into the second chamber through a perforated pipe in the second chamber. According to the noise elimination principle of a perforated pipe, most of the noise in the medium and low frequency bands can be eliminated.
[0020] The aperture of the side holes on the first perforated pipe is smaller than that of the side holes on the second perforated pipe and the third perforated pipe; the perforation rate of the side holes on the first perforated pipe is higher than that of the side holes on the second perforated pipe and the third perforated pipe, which can better concentrate on eliminating the noise in certain medium and low frequency bands.
[0021] The first asbestos and the second asbestos are filled in the second chamber and the fourth chamber respectively, which play the role of sound-absorbing materials to eliminate the noise in the high frequency band.
[0022] The contact parts of each straight-through pipe and each partition are all full welded, and the partition and the carbon steel shell 12 are all full welded, which plays the role of separating the chambers and ensures the noise elimination efficiency.
[0023] The combination of a 60° elbow, two 60° elbows, a four-way straight-through pipe, a third perforated pipe, a 120° elbow, and a second perforated pipe in the fourth chamber forms a combination of bent pipes. In an effective space, the flow direction of the air flow is changed, but the curvature radius is not too large, so that the air flow is not overly unsmooth. Adding the second asbestos in the fourth chamber can eliminate the high frequency noise to a greater extent, which is a supplement to the noise elimination effect of the second chamber and can extend the service life of the muffler to a certain extent.
[0024] Through the design of each structure, the present utility model can eliminate the noise in the medium and low frequency bands and the high frequency band, with high noise elimination efficiency and can extend the service life of the muffler. BRIEF DESCRIPTION OF THE DRAWINGS
[0025] The drawings are used to provide a further understanding of the present utility model, and constitute a part of the specification. Together with the embodiments of the present utility model, they are used to explain the present utility model, but do not constitute a limitation to the present utility model.
[0026] Figure 1 It is a schematic diagram of the overall structure of the present utility model;
[0027] Figure 2 It is a schematic diagram of the internal structure of the present utility model.
[0028] In the figure: 1 - a straight pipe, 2 - a front partition board, 3 - a first partition board, 4 - a second straight pipe, 5 - a perforated pipe, 6 - a second partition board, 7 - a third partition board, 8 - a rear partition board, 9 - a first asbestos, 91 - a second asbestos, 10 - a third straight pipe, 11 - a 60° elbow, 12 - a carbon steel shell, 13 - a second 60° elbow, 14 - a fourth straight pipe, 15 - a third perforated pipe, 16 - a 120° elbow, 17 - a second perforated pipe, 18 - a first chamber, 19 - a second chamber, 20 - a third chamber, 21 - a fourth chamber. Detailed implementation mode
[0029] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model;
[0030] Refer to Figure 1-2 , a racing car muffler, including a carbon steel shell 12, a front partition board 2 is fixedly installed at the front end of the carbon steel shell 12, a rear partition board 8 is fixedly installed at the rear end of the carbon steel shell 12, a first partition board 3, a second partition board 6, and a third partition board 7 are fixedly installed in the carbon steel shell 12 in sequence from front to back. A first chamber 18 is provided between the front partition board 2 and the first partition board 3, a second chamber 19 is provided between the first partition board 3 and the second partition board 6, the second chamber 19 is filled with a first asbestos 9, a third chamber 20 is provided between the second partition board 6 and the third partition board 7, a fourth chamber 21 is provided between the third partition board 7 and the rear partition board 8, and the fourth chamber 21 is filled with a second asbestos 91;
[0031] A straight pipe 1 is installed in the carbon steel shell 12. The front end of the straight pipe 1 is fixed on the front partition board 2 and extends to the front side of the front partition board 2. The rear end of the straight pipe 1 passes through the first chamber 18 and extends into the second chamber 19 and is fixedly communicated with the front end of a perforated pipe 5; the rear end of the perforated pipe 5 extends into the third chamber 20 and is fixedly installed with the second partition board 6, and a plurality of side holes are opened on the pipe body of the perforated pipe 5;
[0032] A second straight pipe 4, a third straight pipe 10, a 60° elbow 11, a second 60° elbow 13, a fourth straight pipe 14, a third perforated pipe 15, a 120° elbow 16, and a second perforated pipe 17 are also installed in the carbon steel shell 12;
[0033] The front ends of the second straight pipe 4 and the third straight pipe 10 are both fixedly installed on the first partition board 3, and the front ends of the second straight pipe 4 and the third straight pipe 10 both extend into the first chamber 18. The rear end of the second straight pipe 4 is fixed on the second partition board 6 and extends into the third chamber 20, and the rear end of the third straight pipe 10 is fixed on the third partition board 7 and extends into the fourth chamber 21;
[0034] A 60° elbow 11, two 60° elbows 13, a perforated pipe 15, a 120° elbow 16 and two perforated pipes 17 are all located in the fourth cavity 21.
[0035] The front end of the first 60° elbow 11 is fixed to the rear end of the three-way pipe 10, the rear end of the first 60° elbow 11 is fixed to the front end of the second perforated pipe 17, the rear end of the second perforated pipe 17 is fixed to the front end of the 120° elbow 16, the rear end of the 120° elbow 16 is fixed to the front end of the third perforated pipe 15, the rear end of the third perforated pipe 15 is fixed to the front end of the second 60° elbow 13, the rear end of the second 60° elbow 13 is fixed to the front end of the four-way pipe 14, the four-way pipe 14 is fixed to the rear partition 8, and the rear end of the four-way pipe 14 extends to the rear side of the rear partition 8. Side holes are provided on the sides of the second perforated pipe 17 and the third perforated pipe 15.
[0036] Further, the connections between the front partition 2, the first partition 3, the second partition 6, the third partition 7, the rear partition 8 and the carbon steel shell 12 are all full welds.
[0037] Further, the connections between the first straight pipe 1 and the front partition 2, the first partition 3, and the second partition 6 are all full welds; the connections between the second straight pipe 4 and the three-way pipe 10 and the first partition 3 and the second partition 6 are all full welds, and the connection between the three-way pipe 10 and the third partition 7 is a full weld; the connection between the four-way pipe 14 and the rear partition 8 is a full weld.
[0038] Further, the aperture of the side holes on the first perforated pipe 5 is smaller than the aperture of the side holes on the second perforated pipe 17 and the third perforated pipe 15; the perforation rate of the side holes on the first perforated pipe 5 is higher than the perforation rate of the side holes on the second perforated pipe 17 and the third perforated pipe 15.
[0039] Preferably, the arrangement forms of the first straight pipe 1, the second straight pipe 4, the three-way pipe 10, and the four-way pipe 14 can achieve the purpose of extending the air flow passage.
[0040] The first asbestos 9 and the second asbestos 91, as sound-absorbing materials, are more heat-resistant and more economical than glass fiber.
[0041] The working principle of the present utility model is:
[0042] The exhaust gas flow enters the interior of the muffler through a straight pipe 1. In the second chamber 19, the gas flow discharges from the holes on the side wall of a perforated pipe 5 and enters the first asbestos 9, eliminating a part of the medium and high-frequency noise. At the same time, it discharges from the tail of the pipe extending from the straight pipe 1 to the third chamber 20. The gas flow diverges and vibrates in the third chamber 20, then enters the second straight pipe 4, discharges from the second straight pipe 4 into the first chamber 18, diverges and vibrates in the first chamber 18, and then enters the third straight pipe 10. When the gas flow reaches the fourth chamber 21, it discharges from the side holes on the side walls of the second perforated pipe 17 and the third perforated pipe 15 and enters the second asbestos 91, eliminating a part of the medium and high-frequency noise and also complementing the elimination of a part of the low-frequency noise. Finally, the gas flow discharges from the fourth straight pipe 14. (Matters not described in the present utility model are applicable to the prior art).
[0043] Compared with the prior art, the beneficial effects of the present utility model are as follows:
[0044] The gas enters the muffler through a straight pipe 1. In the second chamber 19, it is discharged into the second chamber 19 through a perforated pipe 5. According to the sound absorption principle of the perforated pipe 5, most of the medium and low-frequency noise can be eliminated.
[0045] The aperture of the side holes on the perforated pipe 5 is smaller than that of the side holes on the second perforated pipe 17 and the third perforated pipe 15; the perforation rate of the side holes on the perforated pipe 5 is higher than that of the side holes on the second perforated pipe 17 and the third perforated pipe 15, which can better concentrate on eliminating the noise in certain medium and low-frequency bands.
[0046] The first asbestos 9 and the second asbestos 91 are filled in the second chamber 19 and the fourth chamber 21 respectively, which play the role of sound absorption materials to eliminate the high-frequency noise.
[0047] The contact parts between each straight pipe and each partition are all full welded, and the partitions and the carbon steel shell 12 are all full welded, which play the role of separating the chambers and ensure the sound absorption efficiency.
[0048] The combination of a 60° elbow 11, a second 60° elbow 13, a fourth straight pipe 14, a third perforated pipe 15, a 120° elbow 16, and a second perforated pipe 17 in the fourth chamber 21 forms a combination of bent pipes. In an effective space, the direction of the gas flow is changed, but the radius of curvature is not too large to cause excessive inefficiency of the gas flow. Adding the second asbestos 91 in the fourth chamber 21 can eliminate the high-frequency noise to a greater extent, which is a supplement to the sound absorption effect of the second chamber 19 and can extend the service life of the muffler to a certain extent.
Claims
1. A racing car muffler, comprising a carbon steel outer shell (12), characterized in that, A front partition plate (2) is fixedly installed at the front end of the carbon steel outer shell (12), a rear partition plate (8) is fixedly installed at the rear end of the carbon steel outer shell (12), a first partition plate (3), a second partition plate (6), and a third partition plate (7) are fixedly installed in the carbon steel outer shell (12) in sequence from front to back. A first chamber (18) is provided between the front partition plate (2) and the first partition plate (3), a second chamber (19) is provided between the first partition plate (3) and the second partition plate (6), the second chamber (19) is filled with first asbestos (9), a third chamber (20) is provided between the second partition plate (6) and the third partition plate (7), a fourth chamber (21) is provided between the third partition plate (7) and the rear partition plate (8), and the fourth chamber (21) is filled with second asbestos (91). A straight-through pipe (1) is installed in the carbon steel outer shell (12). The front end of the straight-through pipe (1) is fixed on the front partition plate (2) and extends to the front side of the front partition plate (2). The rear end of the straight-through pipe (1) passes through the first chamber (18) and extends into the second chamber (19) and is fixedly connected to the front end of a perforated pipe (5). The rear end of a perforated pipe (5) extends into the third chamber (20) and is fixedly installed on the second partition plate (6). A plurality of side holes are provided on the pipe body of a perforated pipe (5). A second straight-through pipe (4), a third straight-through pipe (10), a 60° elbow (11), a second 60° elbow (13), a fourth straight-through pipe (14), a third perforated pipe (15), a 120° elbow (16), and a second perforated pipe (17) are also installed in the carbon steel outer shell (12). The front ends of the second straight-through pipe (4) and the third straight-through pipe (10) are both fixedly installed on the first partition plate (3) and extend into the first chamber (18). The rear end of the second straight-through pipe (4) is fixed on the second partition plate (6) and extends into the third chamber (20). The rear end of the third straight-through pipe (10) is fixed on the third partition plate (7) and extends into the fourth chamber (21). The 60° elbow (11), the second 60° elbow (13), the third perforated pipe (15), the 120° elbow (16), and the second perforated pipe (17) are all located in the fourth chamber (21). The front end of the 60° elbow (11) is fixed on the rear end of the third straight-through pipe (10), the rear end of the 60° elbow (11) is fixed on the front end of the second perforated pipe (17), the rear end of the second perforated pipe (17) is fixed on the front end of the 120° elbow (16), the rear end of the 120° elbow (16) is fixed on the front end of the third perforated pipe (15), the rear end of the third perforated pipe (15) is fixed on the front end of the second 60° elbow (13), the rear end of the second 60° elbow (13) is fixed on the front end of the fourth straight-through pipe (14), the fourth straight-through pipe (14) is fixed on the rear partition plate (8) and extends to the rear side of the rear partition plate (8). Side holes are provided on the sides of the second perforated pipe (17) and the third perforated pipe (15).
2. The racing car muffler according to claim 1, characterized in that, The connections of the front partition (2), the first partition (3), the second partition (6), the third partition (7), and the rear partition (8) to the carbon steel shell (12) are all full welds.
3. The racing car muffler according to claim 1, characterized in that, The connections of the straight pipe (1) to the front partition (2) and the first partition (3) are all full welds. The connections of the second straight pipe (4) and the third straight pipe (10) to the first partition (3) and the second partition (6) are all full welds, and the connection of the third straight pipe (10) to the third partition (7) is a full weld. The connection of the fourth straight pipe (14) to the rear partition (8) is a full weld.
4. The racing car silencer according to claim 1, characterized in that, The aperture diameter of the side holes on the first perforated pipe (5) is smaller than the aperture diameters of the side holes on the second perforated pipe (17) and the third perforated pipe (15). The perforation rate of the side holes on the first perforated pipe (5) is higher than the perforation rates of the side holes on the second perforated pipe (17) and the third perforated pipe (15).